C 430 
XXXI. Of the difference of longitudes found by chronometer, and 
by correspondent eclipses of the satellites of Jupiter ; with some 
supplementary information relative to Madras, Bombay, and 
Canton ; as also the latitude and longitude of Point de GalU 
and the Friar’s Hood. By J. Goldingham, Esq. F. R. S. 
Read June 27, 1822. 
Of the difference of longitude fou?id by chronometer, and by corns - 
pondent eclipses of the satellites of Jupiter. 
In my former Paper, I mentioned these methods of finding 
the longitude, after the distance of one point from a first and 
distant meridian had been correctly established, and at the 
same time carried both into practice ; the former, in deducing 
the longitude of Bombay, and the latter, in the operation for 
the longitude of Calcutta ; and I bring forward the following 
observations by these methods, to show what maybe effected 
in practice by either, where the instruments are good, and 
the necessary precautions have been taken. The observa- 
tions at Masulipatam were taken by the late Mr. Topping, 
those at the Observatory, by myself. The telescopes at 
both places were the same in construction and magnifying 
power.* 
• Masulipatam is not two days sail from Madras in the S. W. monsoon. 
